Final answer:
Uremia is the condition that develops when blood levels of nitrogenous wastes reach toxic levels. Symptoms include diarrhea, vomiting, dyspnea, and cardiac arrhythmia.
Step-by-step explanation:
The condition that develops when blood levels of nitrogenous wastes reach toxic levels is called uremia. Uremia occurs when there is a buildup of urea in the blood, which can happen when the kidneys are not functioning properly. Symptoms of uremia include diarrhea, vomiting, dyspnea (difficulty breathing), and cardiac arrhythmia (irregular heartbeat).